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Culms

not every character is illustrated

C-1. Habit: 0 = erect; 1 = apically arching/pendulous; 2 = clambering/scandent; 3 = twining; 4 = decumbent.

C-2. Culm internodes: 0 = all solid (at least when young); 1 = all hollow; 2 = some proximal internodes (including the basalmost ones) solid, distal internodes hollow.

C-3. Wall thickness (ratio of 2X wall thickness: culm diameter): 0 = walls very thin (ratio up to 0.15); 1 = walls thin (ratio 0.16-0.30); state 2 = walls moderately thick (ratio 0.31-0.45); 3 = walls thick (ratio 0.46-0.60); 4 = walls very thick (ratio 0.61-0.99).

C-4. Lacuna size: 0 = lacuna large, > 1/3 the diameter of the culm; 1 = lacuna small, < 1/3 the diameter of the culm.

C-5. Vegetative culm branching: 0 = present; 1 = absent.

C-6. Branch initiation/development: 0 = acropetal (toward the apex, i.e., branching begins at the base and proceeds toward the apex); 1 = basipetal (toward the base, i.e., branching begins at the apex and proceeds toward the base; 2 = bidirectional (starting at mid-culm and proceeding toward the base and toward the apex simultaneously).

C-7. Internode length (relative): 0 = all internodes more or less equally elongated along the culm (excluding the normal variation in size between basal/apical internodes and those of the mid-culm); 1 = one elongated internode regularly alternating with 1 to 4 very shortened internodes; 2 = the first internode greatly elongated (up to 5 m long) with additional apical internodes (if present) very shortened.

C-8. Nodal line position: 0 = horizontal; 1 = dipping slightly below the bud(s); 2 = dipping markedly below the bud(s).

C-9. Nodal line diameter: 0 = more or less the same diameter as the adjacent internodes; 1 = borne on a flange-like extension (patella), its diameter greater than the adjacent internodes.

C-10.  Supranodal ridge:  0 = inconspicuous (a line, diameter less than at the nodal line); 1 = conspicuous (a ridge, diameter equal to or greater than at the nodal line).

C-11.  Aerial roots:  0 = absent; 1 = present on the lower nodes only; 2 = present on lower and upper nodes.

C-12.  Aerial root morphology:  0 =  root-like (more or less elongated, firm, and rounded at the apices); 1 = spine-like (short, hardened, and pointed).

Life Span and Rhizomes
Culms
Buds and Branching
Culm Leaves
Foliage Leaves
Synflorescences
Spikelets
Flowers and Fruits
Leaf Anatomy
Leaf Micromorphology

 

c-1
C-1, click for larger image

c06
C-6, click for larger image
c-7
C-7, click for larger image
c-8
C-8, click for larger image
c-9
C-9, click for larger image
c-11
C-10, click for larger image

C-12, click for larger image

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Contact - Dr. Lynn Clark   Copyright © 2005-2006, Iowa State University. All rights reserved.